Mockups in AFPHOTO format are available on TutKit.com for use with Affinity Photo 1.5 and higher. To insert a design, all you have to do is open a mockup and place your design. This is how you proceed step by step:

1. Open a mockup in Affinity Photo.
2. Select a layer with an embedded document.
3. Activate the Move tool.
4. Select the Edit document option in the context menu of the Move tool. This will open a window with the layer of the embedded document into which you can insert your design.
5. Select your design on your computer and place it in the mockup.
6. Close the window.

In some mockups, you also have several layers with embedded documents at your disposal, into each of which you can insert a design.